Endocarditis, or infective endocarditis, is inflammation of your heart’s inner lining, called the endocardium. It usually occurs when bacteria or other germs from another part of your body, such as your mouth, spread through your bloodstream and attach to damaged areas in your heart. Left untreated, endocarditis can damage or destroy your heart valves and can lead to life-threatening complications.

Endocarditis is uncommon in people with healthy hearts. This infection can damage your heart and needs to be treated right away. If it isn't treated, endocarditis can be deadly.